A possible concise summary is:
Rebecca Zamolo becomes the assistant of Evelyn, a ghost, for 24 hours and tries to get her phone to hack into her camera roll. She finds out that Evelyn is planning a ritual to release her brothers from a phone and get them bodies by Saturday. She also sees that Evelyn hates Maddie, her ex-boyfriend's girlfriend, and has taken their gender reveal. Meanwhile, Daniel and Matt search Maddie's room for clues and find a drawing of Evelyn's seance and a note about a spell. They also access Evelyn's camera roll and see that she has been tracking the tunnel system and the motherboard. They discover a video of the Halloween hacker telling Evelyn that saying the poem at the end of the birth to death of a ghost program is the key to something. They decide to go back to middle school to find the proton packs and stop Evelyn.
Here are the key facts extracted from the text:
1. Rebecca Zamolo is becoming an assistant to a ghost named Evelyn for 24 hours.
2. The purpose is to place a device on Evelyn's phone to access her camera roll.
3. Maddie is currently missing, and the boys are searching her room for clues.
4. Rebecca needs to make slime as part of her tasks as an assistant.
5. The slime is needed by Saturday for an unknown reason.
6. Evelyn was a birth to death teacher before becoming a ghost.
7. Rebecca is disguised in blue, which Evelyn questions as she prefers black.
8. The Candy Queen sent Rebecca as an assistant to Evelyn.
9. Daniel and Matt are trying to find clues in Maddie's room.
10. Rebecca hacked into the surveillance system at the Donut Life Museum for safety.
11. Evelyn has brothers who are ghosts, and she plans to release them on Saturday.
12. The boys find a clue in Maddie's room related to Evelyn's brothers' gravesite.
13. Rebecca successfully places the device on Evelyn's phone.
Please note that these are factual statements based on the provided text and do not include any opinions or subjective interpretations.